Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       naturalia - natural bodies
         Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
           ?viruses
             Realm Riboviria
               Family Potyviridae
                 Genus Bymovirus
                   1? Rice necrosis mosaic virus
                   2.1 Barley mild mosaic virus
                   2.2? Barley yellow mosaic virusᵀ
                   3.1.1 Wheat yellow mosaic virus
                   3.1.2? Wheat spindle streak mosaic virus
                   3.2 Oat mosaic virus